/*
 * Copyright 2009 Original Author(s)
 * 
 * This file is part of Kommando
 * 
 * Kommando is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Kommando is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Kommando.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.kommando.proxyobjects;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.kommando.core.catalog.CatalogObject;
import org.kommando.core.util.Assert;
import org.osgi.util.tracker.ServiceTracker;

/**
 * @author Peter De Bruycker
 * 
 */
public class ServiceTrackerProxyObjectSource extends AbstractProxyObjectSource {

    private ServiceTracker proxyObjectTracker;

    public ServiceTrackerProxyObjectSource(ServiceTracker tracker) {
        Assert.argumentNotNull("tracker", tracker);

        proxyObjectTracker = tracker;
    }

    @Override
    protected List<CatalogObject> getProxyObjects() {
        Object[] services = proxyObjectTracker.getServices();
        if (services == null) {
            return Collections.emptyList();
        }

        List<CatalogObject> proxyObjects = new ArrayList<CatalogObject>();
        for (Object service : services) {
            ProxyObject proxyObject = (ProxyObject) service;
            proxyObjects.add(new ProxyCatalogObject(proxyObject));
        }

        return proxyObjects;
    }

}
